Yeah Flash, I have seen the fish for sale in these places and I genuinely feel sympathy for people who can't get fresh fish elsewhere. As you say, Morgans product is generally pretty good as it doesn't come from the seine guys and I am always happy to eat in there.
The beach seine guys here get away with it because the product isn't consumed by humans and cats wouldn't know the difference out of a can.
I had some farm prawns on the weekend which were just as good as any frozen wild prawn that I've had in recent years. Raises the question in my mind given the quality of fish on the shelf that is the norm now, whether the general public wouldn't be just as well off eating aquacultured fish. Certainly our wild fish stocks would be better off and I believe that there is the same quantity of omega 3 in farm fish as there is in wild fish.
With not being able to catch fish here at the moment for the sake of the cats and a few netters, I still wouldn't be buying fish irrespective of where it came from. Fortunately I have some reefies in the freezer and when they run out I'll eat lamb.